Preliminary

June 26, 2003 Ver. 2

Externally Applied Reference Voltage (Vref)

APPLICATIONS

Ceramic Capacitors Compatible

Power Supply for LCD

Input Voltage Range: 0.9V~10.0V

PDAs

Oscillation Frequency: 300kHz, 100kHz (±15%)

Cellular Phones

PWM Control (XC9106)

Palmtop Computers

PWM/PFM Automatic Switching Control (XC9107)

Portable Audio Systems

SOT-25 / USP-6B Packages

Various Multi-function Power Supplies

GENERAL DESCRIPTION

FEATURES

Input Voltage Range:

0.9V ~ 10.0V

Power Supply Voltage Range:

1.8V ~ 10.0V and more than Vref+0.7V

VREF Input Range:

0.8V ~ 2.5V (

2.0%)

Output Voltage:

Vref x external split resistor ratio
VOUT=Vref x (RFB1+RFB2)/RFB2

Oscillation Frequency:

300kHz, 100kHz

15%

Output Current:

more than 30mA

Controls:

PWM (XC9106)
PWM/PFM auto-switching (XC9107)

High Efficiency:

85% (TYP.)

Stand-by Current:

ISTB=1

A (MAX.)

Load Capacitors:

Low ESR capacitors compatible

Packages:

SOT-25, USP-6B

TYPICAL APPLICATION CIRCUIT

TYPICAL APPLICATION PERFORMANCE

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

Externally Applied Reference Voltage (Vref)

XC9106 / 07 Series

(VIN=3.3V, VOUT=20V, when peripheral
components are used as in the circuits below .)

* RSENSE is of no use in light load (uncontinuous mode) applications such
as a small LCD, even using ceramic capacitor.

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Vref (V)

OUT

)

0.1

100

1000

OUT

(mA)

OUT

)

2.0V

Vref=0.8V

1.5V

2.5V

Circuit as left

=3.3V, I

OUT

=30mA

XC9107D003MR

Circuit as left

=3.3V

L : 10

SD : MA737

CFB : 27pF

Nch Power

MOS FET

2SK2159

= 3.3V

RFB2 :

30k

RFB1 :

270k

OUT

= 8V~25V

OUT

= 30mA

D/A converter

Ceramic CL :

CE/Vref

CIN

RSENSE : 100m

for Ceramic CL

0.8V~2.5V

The XC9106 / 07 series are step-up DC/DC controller ICs
with an externally applied reference voltage (Vref).
Output voltage will be set with external resistors (RFB1 and 2)
and Vref value. The series make it easy to control output
voltage externally and are suited to software applications that
need to vary voltage, such as LCD power supply for PDA.
Output will be stable no matter which load capacitors are
used but if a low ESR capacitor is used, RSENSE of about
0.1

will be required and phase compensation will be

achieved. This makes the use of ceramic capacitors much
easier, and allows for lower output ripple and reduced PCB
area requirements. Tantalum and electrolytic capacitors can
also be used, in which case, RSENSE becomes
unnecessary.
Oscillation frequencies of high clock, low ripple 300kHz and
low supply current 100kHz are available.
The XC9107 series are PWM/PFM automatic switching
controlled. Control switches from PWM to PFM during light
loads with the XC9107 and the series is highly efficient from
light loads to large output currents. By bringing the whole
circuit down while the series is in the stand-by mode
(CE/PWM pin : low), supply current can be reduced to less
than 1.0

Semiconductor Ltd.

Preliminary

PIN CONFIGURATION

PIN ASSIGNMENT

ORDERING INFORMATION

XC9107 Series: PWM/PFM automatic switching control

XC9106 Series: PWM Control

(Ordering information is the same as XC9106 Series)

Reference Voltage (apply external)
Fixed : 00

Oscillation Frequency:

300kHz
100kHz

Package:

SOT-25 (1 reel = 3000 pcs.)
USP-6B (1 reel = 3000 pcs.)

Embossed Tape:

Standard Feed
Reverse Feed

PACKAGING INFORMATION

SOT-25 (SOT-23-5)

USP-6B

Externally Applied Reference Voltage (Vref)

XC9106 / 07 Series

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

FUNCTION

Ground

GND

VDD

Supply Voltage

No Connection

NAME

XC9107D

12345

Output Resistor Connection

External Transistor Connection

EXT

6
2

SOT-25 USP-6B

XC9106D

12345

Serves as both Chip Enable pin and

Reference Voltage Apply pin.

CE/

Vref

3
1

PIN NUMBER

SOT-25

(TOP VIEW)

USP-6B

(TOP VIEW)

AAA

2.0 + 0.15

(0.45) 0.5+0.1

(0.05)

(0.45) (0.45)

8+0.

7
)

(
0
.
27)

.
2
7
)

(

.
4
5
)

2
5
)

5
)

005

+0.

0
02

.
0
5
)

-0

.
0
0
5

.
0
1

-0

.
0
5

.
1
5

0.7+0.03

2+0.

5+0.

6
+
0.

5+0.

1+0.

2+0.

1.0+0.1

0.25+0.1

Semiconductor Ltd.

Preliminary

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Ta = 25

XC9106 / 07 Series

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

Externally Applied Reference Voltage (Vref)

Storage Temperature

RATINGS

UNITS

V
V

-0.3 ~ 12.0
-0.3 ~ 12.0

SOT-25

USP-6B

-0.3 ~ 12.0

Tstg

-55 ~ +125

VDD

VFB

VCE / Vref

-0.3 ~ VDD + 0.3

Topr

VEXT

IEXT/

±100

150
100

-40 ~ +85

SYMBOL

EXT pin Current

Power Dissipation

Operating Ambient Temperature

PARAMETER

VDD pin Voltage

FB pin Voltage

CE / Vref pin Voltage

EXT pin Voltage

Ramp Wave

Generator,

OSC

Current

Ripple Detect

and FB

PWM/PFM

Controller

Phase

Compensation

Vref with
Soft Start,

Buffer,

Driver

Error Amp.

PWM

Comparator

VDD

EXT

GND

CE / Vref

FB, CE : CMOS INPUT
EXT : CMOS OUTPUT

Semiconductor Ltd.

Preliminary

ELECTRICAL CHARACTERISTICS

XC9106D001MR, XC9107D001MR

(FOSC=100 (kHz)

Ta=25

Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOS FET should be connected.

VDD =

(V)

Vref =

(V) ,

RFB1, 2 x 10

VIN =

(V)

IOUT =

(mA)

Notes 1* :

XC9106 / 07 Series

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

Externally Applied Reference Voltage (Vref)

No external connections

Although the IC starts step-up operations from a VDD of 0.8V, the output voltage and oscillation frequency are stabilized at
VDD

1.8V or (Vref applied voltage + 0.7V). Therefore, a VDD of more than 1.8V or (Vref applied voltage + 0.7V) is recommended when VDD is

supplied from VIN or other power sources.

CIRCUIT

8.820

9.000

9.180

0.8

2.5

UNITS

1.0

4
1

KHz

PARAMETER

Output Voltage

Reference Voltage Range

Operation Start Voltage

Power Supply Voltage Range

PFM Duty Ratio

FOSC

MAXDTY
PFMDTY

Oscillation Frequency

FB Control Voltage

VFB

Same as IDD1

Maximum Duty Ratio

Same as IDD1

Oscillation Start Voltage

VST2

CE/Vref=0.9V, Voltage applied, FB=0V

VST1

Recommended Circuit using 2SD1628, IOUT=1.0mA

Supply Current 2

Operation Holding Voltage

Supply Current 1

VDD

Vref = 0.9V

VDD as shown right or (Vref applied voltage+0.7V)

Efficiency

Recommended Circuit using 2SD1628, IOUT=1.0mA
Same as VST2, VDD=3.300V

ISTB

VHLD

IDD1
IDD2

Same as IDD1, CE/Vref=0V

Same as IDD1, FB=1.2V

Stand-by Current

No Load (XC9106 series)
Recommended Circuit using XP161A1355

EFFI

Soft-start Time

Vref=0.9V

TSS

5.0

10.0

20.0

CE "Low" Voltage

VCEL

Same as IDD1

CE "High" Voltage

VCEH

Same as IDD1

0.20

EXT "Low" ON Resistance

REXTL

Same as IDD1, VEXT=VOUT-0.4V

EXT "High" ON Resistance

REXTH

Same as IDD1, VEXT=0.4V

CE "Low" Current

ICEL

Same as IDD2, CE=0.8V

Same as IDD2, CE=0V

-1.0

0.0

Same as IDD2, FB=VDD

-0.1

0.1

FB "High" Current

IFBH

Same as IDD2, FB=1.0V

IFBL

-0.1

1.8

CONDITIONS

Vref = 0.9V

SYMBOL

VOUT

Vref

MIN.

TYP.

MAX.

0.784

0.800

0.816

0.8

10.0

0.9

0.7

100

115

0.65

FB "Low" Current

0.09

3.30
3.30

Vref = 0.9V
Vref = 2.5V

0.882

0.900

0.918

2.450

2.500

2.550

CE "High" Current

ICEH

Same as IDD2, CE=2.5V

0.0

2.5

Semiconductor Ltd.

Preliminary

ELECTRICAL CHARACTERISTICS

XC9106D003MR, XC9107D003MR

(FOSC=300 (kHz)

Ta=25

Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOS FET should be connected.

VDD =

(V)

Vref =

(V) ,

RFB1, 2 x 10

VIN =

(V)

IOUT =

(mA)

Notes 1* :

TYPICAL APPLICATION CIRCUIT

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

Externally Applied Reference Voltage (Vref)

Although the IC starts step-up operations from a VDD of 0.8V, the output voltage and oscillation frequency are stabilized at
VDD

1.8V or (Vref applied voltage + 0.7V). Therefore, a VDD of more than 1.8V or (Vref applied voltage + 0.7V) is recommended when VDD is

supplied from VIN or other power sources.

XC9106 / 07 Series

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNITS CIRCUIT

Output Voltage

VOUT

Vref = 0.9V

8.820

9.000

9.180

Reference Voltage Range

Vref

0.8

2.5

Vref = 0.8V

0.784

FB Control Voltage

VFB

Vref = 0.9V

0.882

0.800

0.816

Power Supply Voltage Range

VDD

VDD as shown right or (Vref applied voltage + 0.7V)

1.8

10.0

Operation Start Voltage

VST1

Recommended Circuit using 2SD1628, IOUT=1.0mA

0.9

Oscillation Start Voltage

VST2

No external connections
CE/Vref=0.9V, Voltage applied, FB=0V

0.8

Operation Holding Voltage

VHLD

Recommended Circuit using 2SD1628, IOUT=1.0mA

0.7

Supply Current 1

IDD1

Same as VST2, VDD=3.300V

Supply Current 2

IDD2

Same as IDD1, FB=1.2V

Stand-by Current

ISTB

Same as IDD1, CE/Vref=0V

1.0

Oscillation Frequency

FOSC

Same as IDD1

255

300

345

KHz

Maximum Duty Ratio

MAXDTY Same as IDD1

PFM Duty Ratio

PFMDTY No Load (XC9106 series)

Efficiency

EFFI

Recommended Circuit using XP161A1355

Soft-start Time

TSS

Vref=0.9V

5.0

10.0

20.0

CE "High" Voltage

VCEH

Same as IDD1

0.65

CE "Low" Voltage

VCEL

Same as IDD1

0.20

EXT "High" ON Resistance

REXTH

Same as IDD1, VEXT=VOUT-0.4V

EXT "Low" ON Resistance

REXTL

Same as IDD1, VEXT=0.4V

Same as IDD2, CE=0.8V

-1.0

CE "High" Current

ICEH

Same as IDD2, CE=2.5V

0.0

CE "Low" Current

ICEL

Same as IDD2, CE=0V

-0.1

FB "High" Current

IFBH

Same as IDD2, FB=VDD

0.1

FB "Low" Current

IFBL

Same as IDD2, FB=1.0V

-0.1

3.30

0.09

3.30

When obtaining VDD from a source other than VOUT, please insert a
capacitor CDD between the VDD pin and the GND pin in order to
provide stabler operations.
Please wire CL & CIN between the VOUT/VDD pin and the GND pin.
Strengthen the wiring sufficiently. When using a capacitor other than
ceramic or low ESR at CL, please take away RSENSE and short.

Insert Rb and CB when using a
bipolar NPN Transistor.

0.900

0.918

Vref = 2.5V

2.450

2.500

2.5

0.0

OUT

Nch Power

MOS FET

RSENSE

FB1

FB2

CE/Vref

Semiconductor Ltd.

Preliminary

OPERATIONAL DESCRIPTION

The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the OSC Generator.

TSS = 8.65 x Vref + 2.21

[Example Computation]

Vref = 0.9V, TSS = 8.65 x 0.9 + 2.21 = 10.0 ms

XC9106 / 07 Series

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

This function controls the operation and shutdown of the IC. When the voltage of the CE pin drops to 0.2V or less, disable mode will be entered, the
IC's operations will stop and the EXT pin will be kept at a low level (the external N-type MOSFET will be OFF) . When the IC is in a state of chip
disable, current consumption will be no more than 1.0

When the CE pin's voltage rises to 0.65V or more, enable mode will be entered and operations will recommence. The CE pin also doubles with
reference voltage in the XC9106/9107 series, and the range of reference voltage can be varied externally from 0.8V to 2.5V.

The XC9106/9107 series alters soft start times by the setting value of reference voltage in order to protect against voltage overshoot and also to
protect against inrush current. Please determine soft start time by the formula equation.

Error Amplifier is designed to monitor the output voltage, comparing the feedback voltage (FB) with the reference voltage Vref. In response to
feedback of a voltage lower than the reference voltage Vref, the output voltage of the error amp. decreases.

This circuit generates the internal reference clock.

The PWM Comparator compares outputs from the Error Amp. and saw-tooth waveform. When the voltage from the Error Amp's output is low, the
external switch will be set to ON.

This circuit generates PFM pulses.
The PWM/PFM automatic switching mode switches between PWM and PFM automatically depending on the load. PWM/PFM control turns into
PFM control when threshold voltage becomes lower than voltage of error amps. Noise is easily reduced with PWM control since the switching
frequency is fixed. Because of the function, control suited to the application can easily be selected. The series suitable for noise sensitive portable
audio equipment as PWM control can suppress noise during operation and PWM/PFM switching control can reduce consumption current during light
loads in stand-by.

The reference voltage of the XC9106/9107 series is adjusted and fixed by external applied voltage. (For output voltage settings, please refer to the
output voltage setting on page 7.)
To protect against inrush current, when the power is switched on, and also to protect against voltage overshoot, soft-start time is set internally to
10ms. It should be noted, however, that this circuit does not protect the load capacitor (CL) from inrush current. With the Vref voltage limited, and
depending upon the input to error amp, the operation maintains a balance between the two inputs of error amps and controls the EXT pin's ON time
so that it doesn't increase more than is necessary.

The XC9106 / 07 series are reference voltage (Vref) apply external step-up DC/DC Controler ICs. Output voltage will be set with external resistors
(RFB1 and 2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications that need to vary
voltage such as LCD power supply for PDA.

Externally Applied Reference Voltage (Vref)

XC9106 / XC9107D xxx MR

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Reference Voltage Vref (V)

Soft Start Time : TSS (ms)

Semiconductor Ltd.

Preliminary

FUNCTIONAL SETTINGS

< Output Voltage Setting>

VOUT = Vref applied voltage x (RFB1 + RFB2) / RFB2

fzfb = 30kHz (L=10

RFB1 : 270k

RFB2 : 30k

fzfb = 20kHz (L=22

CFB :

20pF

(fzfb = 30kHz, L = 10

fzfb = 10kHz (L=47

27pF

(fzfb = 20kHz, L = 22

56pF

(fzfb = 10kHz, L = 47

< The use of ceramic capacitor CL >

RECOMMENDED COMPONENTS

Tr:

*When a MOSFET is used :

*When a NPN Tr. Is used :

2SK2159 (NEC N-Channel Power MOSFET)

2SD1628 (Sanyo)
Rb

: 500

(adjust with Tr's HFE or load)

: 2200pF (ceramic type)

1 / (2

FOSC

0.7)

SD:

MA2Q737 (Schottky Diode type, MATSUSHITA)

L, CL :

Adjust as below according to the condition and peripheral components
When Ceramic capacitor is used :
L :

H (SUMIDA CDRH5D28, FOSC = 100kHz)

H (SUMIDA CDRH5D18, FOSC = 300kHz)

CL :

10V 10

F (Ceramic capacitor, LMK325BJ106ML, TAIYOYUDEN)

Use the formula below when step-up ratio and output current is large.
CL = (CL standard value)

(IOUT(mA) / 300mA

VOUT / VIN)

RSENSE : 100m

(FOSC = 300kHz)

50m

(FOSC = 100kHz)

When Tantalum capacitor is used :
L:

H (SUMIDA CDRH5D28, FOSC = 300kHz)

H (SUMIDA CDRH5D28, FOSC = 100kHz)

Except when IOUT(mA) / 100mA

VOUT / VIN > 2

CL:

16V 47

F (tantalum type NIPPONCHEMI 16MCE476MD2)

Use the formula below when step-up ratio and output current is large.
CL = (CL standard value)

(IOUT(mA) / 300mA

VOUT / VIN)

RSENSE:

Not required, but short out the wire.

When AL Electrolytic capacitor is used :
L:

H (SUMIDA CDRH5D28, FOSC = 300kHz)

H (SUMIDA CDRH5D28, FOSC = 100kHz)

Except when IOUT(mA) / 100mA

VOUT / VIN > 2

CL:

16V 100

F (AL electrolytic type) + 10V 2.2

F (ceramic type)

Strengthen appropriately when step-up ratio and output current is large.

RSENSE:

Not required, but short out the wire.

CFB:

Set up so that fzfb = 100kHz.

The circuit of the XC9106/9107 series is organized by a specialized circuit which reenacts negative feedback of both voltage and current. Also by
insertion of approximately 100m

of a low and inexpensive sense resistor as current sense, a high degree of stability is possible even using a

ceramic capacitor, a condition which used to be difficult to achieve. Compared to a tantalum condenser, because the series can be operated in a
very small capacity, it is suited to use of the ceramic capacitor which is cheap and small.

Note* : With direct voltages over 4.5V, use the
XP161A11A1PR.

XC9106 / 07 Series

PWM Control, PWM/PFM Switching Control,

Step-up DC/DC Converters

Externally Applied Reference Voltage (Vref)

The value of CFB1, speed-up capacitor for phase compensation, should result in fzfb = 1/(2

CFB

RFB1) equal to 5 to 30kHz. Adjustments are

required depending on the application, value of inductance (L), and value of load capacity (CL).

Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the values of RFB1
and RFB2. The sum of RFB1 and RFB2 should normally be 2 M

or less. The range of reference voltage of the series can be varied externally

from 0.8V to 2.5V.

Semiconductor Ltd.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: XC9107D1DL

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: XC9107D1DL